Bispectral index monitor prevented intraoperative awareness during partial cardiopulmonary bypass.

摘要

It is well known that a split circuit causes the bispectal index (BIS) value (BIS monitor Aspect A-2000; Aspect Medical Systems, Newton, MA) to decrease to "0" in partial CPB.1 Propofol administered via an upper limb causes an increase in the plasma concentration (Cp) in the area proximal to cross-clamping (CC) of the descending thoracic aorta (DTA), resulting in a reduction of the BIS value.2 We experienced a reverse case in which the BIS value increased after CC of the DTA in a patient in whom propofol was administered via a lower limb.